07' Mac Mini 4GB Ram Upgrade Not Working.

I have a 2007 Mac Mini (Intel Core 2 Duo) which runs slow with 1GB ram. I purchased two 2GB sticks of ram and replaced the two stock ram sticks previously making 1GB ram - But my Mac Mini will not boot with 4GB ram in it. I tried taking one stick out, leaving one 2GB stick in with no luck, and so I have no other ideas. I was told that this would be no problem, and I installed it all correctly following every procedure necessary.
Can anyone help me?

Komputerbay ram is sketchy at best, and another user here:http://forums.macrumors.com had the same experience you are having with that memory, the Mac will not even boot.
The memory for Macs has to be very precise, 5300/5400 is not acceptable as a rule.  It must be straight 5300.  If you can, return the memory modules and buy some guaranteed to work with your Mac.  Go to OWC, http://www.macsales.com or Crucial, http://www.crucial.com who guarantee their memory to work or your money back.

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